I think it would be easier for him to remove the bosses' invincibility frames—but *only* for the Level 3 Buster shot's damage, while keeping the invincibility for Level 1 shots—and also shorten the beam animation; after all, a Level 3 shot that takes too long to deal damage isn't very useful, given that combat is dynamic and the vast majority of enemies and bosses don't just stand there asleep waiting for the entire beam animation to finish...